Carburetor



Sept. 4, 1923.

G. CHRISTIAN CARBURETOR Filed Oct. 9, 1918 Patented Sept. 4, 1923.

VGILBEivr oHnIs-IIAN, or DETROIT, MICHIGAN.

CARBURETOR.

Application filed v.October To @ZZ iokom it may. concern.'

Be it known that I, GILBERT CHRIs'rIANya citizen of the VUnited States, and residing at Detroit, in the county of l/Vayne and State of Michigan, have invented anew Vand, Im-v proved Carbure'tor, of which the following is a specication. f i

This invention relates to devices for combining air and hydrocarbon vapors to constitute an explosive mixture or gas suitable for use in internal `combustion engines of the type shown in my former Patents No. 1,110,041 dated September 8,1914, andvNo. 1,166,112, dated December 28, 1915, and its object is to provide means whereby a small amount of comparatively,rich'mixture'or a large amount of comparatively lean mixture l may be had asdfesired merely by changing the position of the throttle valve.-V

This invention consists in combinationV with the body, the manually.l adjustable tubular throttle valve, and the .cylindrical nozzle having a circumferential discharge opening, of a pair of small pipes or passages in the wall of the throttle` valve which will conduct air and fuel vapor to the discharge opening of the carbureter when the throttle has been pressed down against the nozzle to close the normal passage for the mixed air and fuel vapor. It also consists in the details of construction illustrated in the'aecompanying drawing and specifically pointed out in the claims. Y i A Inthe drawing, Fig. lisa side elevation of this improved carbureter. Fig. 2.is a section on the line 2 2 of Fig. 1 on a larger scale. Fig. 3 is a section on the line 3-3 of Fig. 2. Fig. 4 is a central section of the throttle valve and fuel nozzle at right angles to the plane of Fig. 2.

Similar reference characters referto like parts throughout the several views.

As in Patent No. 1,166,112, thecylindrical shell or body 1 of the mixing chamber has its lower end threaded to receive the locknut 2, between which and the mixing chamber is clamped the bottom of the cup-shaped float chamber 3. The mixing. chamber has a radial flange 4 constituting the top of the float chamber and any desired means may be;

employed to supply liquid fuel to the float chamber and control its level.

Extending across the lower end of the mixing chamber is a tubular support 5 hav-y ing passages 6 communicating with the float chamber. A vertical tube 7 passes through 191s. serial No. 257,522. M

this support randhas its ends threaded. It is also formed with smallv intake passages 8 that communicate with the passages' and also formed with small'discharge-passages tube`12 Vis adapted toconvey hot air. from any convenient source vof supply,'its

inner end preferably fittingayound the lowmY end of thebody'of'the-carbureter. A con'-4 nectorv 13 is screwed ontoj thelower 'end of the tube 7 and anut 14 onvthe' lower end of this connector holds the tube 12 in position.

Threaded vuponrthe tube 7 His a cup 17 whose upper portion constitutes a cylindri cal ilange 18. A collar 19 having a conicall upper end is also threaded upon the tube 7 andi extends into the flange r18 soas to leave a thin radial passage and a thincylin-V drical passage from the small discharge pas'- sage 9 in the ytube 7 to a circumferential dis-V charge opening 2O atthe upper edge of the flange, 18, which edgeis just above the level 2-1 of the liquid in the float chamber.' Thev collar 19 may be locked lin any position 'of adjustment relative tothe Ycup 17 by means of a screw 22. The tube 7,. cup 17 and' col?,k

lar 19 constitute the fuel nozzle which has a circumferential discharge opening through which fuel may liow when the air pressure .l

atfthat line is less than atmospheric.

YSlid'a'ble within theV shellA 1 .is a tubular throttle valve 24 having a Haring lower edge 25 that surrounds 'the upper end of the fuel nozzleand may be forced down onto the collar 19, as shown in Fig. 2to close the normal passage' for the fuel vapor. One side of the shell 21 vmay be formed with' a slot 26 through which passes a bolt 27 whose inner end isthreaded intoa hole 28 in. the

valve 24.Y The outer end' of the bolt passes through a cam slot 29 inthe cam 30 which is pivoted on a bolt 32 at theupper end of the mixing chamber. The downward movement of the throttle valve may be limited by the set screw 33 and nut 34, carried by the cam 30. These parts are substantially similar to those for the. same purpose shown in my prior Patent No. 1,166,112, dated December 28, 1915.

Mounted in the tubular throttlevalve are two small pipes 35 and 36. the former open at both ends and extending down below the lower` end of the latter, as shown in 4. and the latter having its lower end beveled and extending. through the beveled lower surface 25 of the tubular throttle valve that it may suck up liquid fuel from the cup 17 Y a large proportion of airwi-llbe mixed with i idle.

the fuel. The upper end of the' pipe 36 has holes 37 through which the vapor will be sprayed. l

The air pipe extends' down below the bottom of the throttle valve andends just belowthe openings?? in the upper end' of' the pipe 36' so that air willbe drawn up throughV theL pipev V35y and thorougl'ily mixed with the fuel lsprayed from they openingsV 37. The internal Vdia'met'er of the throttle valve will increase upwardly in order to se curethe usual action of the vVenturi tube, lVhen this valve is lowered,` the amount of air passing the fuel openingy 20 will be decreased ,and at Athe same time the iow ofl fuel willdecrease, a fixed' lquantity ofair passing upthe pipel But when thenormal 'ow around,r the lCollar 19 is stopped by thevalve Q /lvengagingthis collar, then a substantially constant amount ,o'fi'fuelt will pass' up intofthe mixing ehambermthroughv,the-

pipe 36 and' air through lthe pipe v 35, which will be' sufficient to permit the engine to The proportions and details of this constructionmayall be yariedy by motive en gineers without departing ,from the spirit of my invention set,` rforth in the following claims.: v

I Claim: .v Y, y 1. In Ya carburetonthe combinationvv of, a bodya fuel nozzle therein havinga circumferential-discharge openin'ga tubular throtf tle valve adjustable toward and fromthe nozzle to control' theA area of the main passage for the explosive m ixt,ur.e manually operable means for positioning,thethrottle vali'e, and' a fuelA pipe ,mountedl in the throttlevalve and so positioned that its intake end will be adjacentpto the fuelmdischarge opening in. the said nozzle when the throttle valve is. at the endfqof its travel toward the. nozzle, the fuel pipebeing perforated near its opposite end to. permit the esfapeof the fuelant l an airpi'pe ,mountedV -in the throttle valve y and, sopositioned that" its intake 4end will be below the-fuel discharge opening, in

the nozzle when' the throttle valve is at the en'd of its tra-vel toward the nozzle, the discharge end of the air pipe being just below the perforations i-nthefuel pipe.

2. In a carburetor, the combination of a body, a fuel nozzle therein having a circumferentialdischarge opening, a tubular throttle valve adjustable toward and from the said nozzle to control the area of the ymain passage for the'xplosive mixture, manu* ally operable means to positionthe throttle, anda pair of pipes extending'up from the lower` end of the throttle and connected thereto to convey yair and fuel respectively when the main passage Vis closed by the'.

throttle. ,y v o y Y In a carburetor, the Vcombinationl of aA body, a fuel nozzle in the lower part thereof having a di'seharge opening@4v tubular throttle valve movable vertically toward and from thenozzle to ontr'lthe area of the' main passagefor the explosive mixture, and a pair of pipes extending up within` the throttle, one to conveyhai'r' andthe other tol convey fuel when I'nainy passa-*ge is closed.4 y 4. In a carburetor, .the combination of a body, a fuel nozzlev in the lower part thereof having a. discharge opening, a tubular throttle valve movable vertically toward and fromthe nozzle' to control thearea` of the lpassage' for the explosive mixture,l and; a pair of pipes extending up within the throttle, one t'o convey air and the other to convey .fuel when the main passage closed, the lower end of the airpi'pe extending-.bellow the fuel discharge opening inthe nozzle whentliemain air passage is closed'.

5. In axcarburetor, the combination ofya body, a fuel nozzle in. thelower part thereof vhaving a dischargeopeningj. ay tubular throttle valve movable vertically toward and from the nozzle t0 control the area of the mainY passage for the explosive mixture, and a pairof pipes extending up .within vthe throttle, one to Aconvey air and' the other to convey fuel', when the main passage is closed, the upper end ofthe fuel pipe being perforated and'I theV upper end t he airpipe terminating justH below the perforati'ons so that the air will mix with the fii'el.

GILBERT CHRISTIAN.

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